Hand-operated attachment for sewing machines



Sept. 29, 1936. R. PLUMLEY ET AL 7 2,056,125

HAND OPERATED ATTACHMENT FOR SEWING MACHINES Filed Maj I5, 1955 I 2 Sheets-Sheet 1 K T 51 T, I? z Se t. 29, 1936. R. L. PLUMLEY ET AL 2,056,125

HAND OPERATED ATTACHMENT FOR SEWING MACHINES Filed May 15, 1955 2 Sheets- Sheet 2 Patented Sept. 29, 1936 UNITED STATES HAND-OPERATED ATTACHMENT FOR SEWING MACHINES Raymond L. Plumley and Richard K. Hohmann,

Brooklyn, N. Y., assignors toThe Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Application May 15, 1935, Serial No. 21,489

8 Claims.

This invention relates to sewing machines and more particularly to a hand-operating device which may be quickly and easily attached to and detached from a portable sewing machine.

In a number of countries electrical power is not supplied continuously, with the result that the owner of a sewing machine which is operated by an electric motor may find that the electrical service has been interrupted just at the time the owner desires to operate the sewing machine. One of the objects of this invention is to provide a. hand attachment for operating a sewing machine which may be quickly attached to the frame of the machine, with a minimum of effort and without the necessity of using implements of any kind. Another object of the invention is toprovide an attachment which may be attached to machines already sold and now in use without the necessity of drilling and tapping holes or otherwise modifying the frame of these machines.

With the above and other objects in view, as will hereinafter appear, the invention comprises the devices, combinations, and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.

The several features of the present invention will be clearly understood from the following description and accompanying drawings in which:

Figure 1 is a side elevation, partly in section, showing the improved driving device.

Figure 2 is a side elevation showing the method of securing one of the supporting legs of the frame of the driving device to the base of the machine.

Figure 3 is an end elevation of the machine showing the driving device attached thereto.

Figure 4 is a sectional view taken substantially along the line l4 of Figure 3.

In the embodiment illustrated in the drawings our improved hand-operated driving attachment is shown applied to a portable sewing machine having an inverted trough-shaped bed i with depending side walls 2 and end walls 3. Carried by the bed I is the usual standard 4 and overhanging bracket-arm 5; The machine is normally driven by means of an electric motor 6 carrying a pulley l which is connected by a belt, (not shown) when the machine is operated by power, to the balance-wheel 8 having a belt-groove 9 therein and secured to the hook-shaft 10. Reference to the U. S. Patent to Hohmann, No. 1,916,860,

dated July 4, 1933, may be had, for a complete and detailed disclosure of this type of sewing machine.

Our improved attachment comprises a frame H having depending supporting legs l2 and I3,

the leg 12 being formed with a foot H! which is adapted to engage the end wall 3 and is secured thereto by means of a bolt it which extends through an aperture in the foot and end wall and is threaded into the rectangular shaped plate l6 fixed to the inner side of the end wall 3 by the bolts ll. The leg I? is formed with an L- shaped foot, the limb l8 of which engages the top surface of the bed I andthe limb I9'engages the end wall 3. The L-shaped foot is held in position by means of the C-clamp 2i) which has one of its ends extending through an aperture 20' formed in the bed and hooked to the mar ginal edge of the aperture and its other end provided with a thumb-screw 2i which bears at an I? angle on the clamp at the junction of the limbs l8 and I9.

Secured to the frame II is a pivot-stud 22 which rotatably carries a gear 23 having fixed thereto by the screws 24 a hand-crank 25. The 5 gear 23 meshes with a pinion 26 which is fixed by the pin 21 to the gear 28 and the gears 26 and 28 are rotatably supported by the pivot-stud 29 fixed to the frame H. The gear 28 meshes with a pinion 30 having a laterally extending finger 32 which is adapted to enter one of the apertures in the balance-wheel 8 and is rotatably carried on a stud 3| secured to the frame I I. It will be observed that the pivot-studs 22, 29 and 3| are arranged in the same vertical plane.

From the foregoing it will be observed that when the hand-crank 25 is rotated the train of gears 23, 26 and 28 cause the gear 30 and finger 32 to rotate about their pivot 3! thereby rotating the balance-wheel 8. The ratio of the gearing is as I is to 10, that is, for each rotation of the hand-crank the balance-wheel 8 is caused to make 10 complete rotations, and as the balancewheel is carried by the hook-shaft the machine makes five complete stitches for each rotation of the hand-crank.

Carried by the frame is a bobbin-winder comprising an arm 33 having one of its ends pivotally secured to the frame H by the pivot-screw 34.

From the foregoing it will be obvious that the attachment may be quickly attached to the bed of the machine by the screw l5 and c-clamp 20 and the L-shaped foot serves to locate the attachment in its proper position and facilitates the placing of the screw l5 in its correct position by partially supporting the attachment.

Having thus set forth the nature of the invention, what we claim herein is:

1. The combination with a sewing machine having a bed, a rotary hook actuating shaft journaled in said bed and carrying a driving wheel having an opening therein, of a frame secured on said bed, a pinion journaled on said frame, a laterally extending finger carried by said pinion and entering the opening in said driving wheel, a driving gear carried by said frame and located above said pinion, a train of gears interposed between said driving gear and said pinion, and a hand-crank secured to said driving gear.

2. The combination with a sewing machine having a bed, a rotary hook actuating shaft journaled in said bed and carrying a driving wheel having an opening therein, of a frame secured to said bed, a pinion journaled on said frame, a laterally extending finger carried by said pinion and entering the opening in said driving wheel, a driving gear rotatably journaled on said frame and located above said pinion, a train of gears rotatably journaled on said frame and interposed between said driving gear and said pinion, the axis of rotation of said gears and pinion being arranged in substantially the same vertical plane, and a hand-crank fixed to said driving gear.

3. The combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls, an actuating shaft journaled in said bed and a balance-wheel fixed to said shaft, of a frame, gearing rotatably carried by said frame and operatively connected to said balance-wheel, a hand-crank for actuating said gearing, depending legs carried by said frame, one of said legs being formed with a foot which is adapted to be fastened to the end wall of said bed, the other leg being formed with an L-shaped foot the limbs of which engage the top and end walls of the bed, and means for holding said last mentioned foot firmly against said bed.

4. The combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls, an actuating shaft journaled in said bed and balance-wheel fixed to said shaft, of a frame, gearing rotatably carried by said frame and operatively connected to said shaft, a hand-crank for actuating said gearing, depending legs carried by said frame, one of said legs being formed with a foot which is adapted to be fastened to the end wall of said bed, the other leg being formed with an L-shaped foot the limbs of which engage the top and end walls of the bed, and a C-clamp having one of its ends entering an aperture in the side wall of said bed and its other end provided with a thumb-screw which bears at an angle against said L-shaped foot at the junction between the limbs of the latter.

5. The combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls, an actuating shaft journaled in said bed and balance-wheel fixed to said shaft, of a frame, gearing rotatably carried by said frame and operatively connected to said shaft, a hand-crank for actuating said gearing, depending legs carried by said frame, one of said legs being formed with a foot having an aperture therein, a plate fixed to the inner side of the end wall of said bed and formed with a threaded aperture, a screw extending through the aperture in said foot and into the threaded aperture in said plate, the other of said legs being formed with an L-shaped foot, and means for holding said last mentioned foot firmly in position on said bed.

6. The combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls, an actuating shaft journaled in said bed and balance-wheel fixed to said shaft, of a frame, gearing rotatably carried by said frame and operatively connected to said shaft, a, hand-crank for actuating said gearing, depending legs carried by said frame, one of said legs being formed with a foot having an aperture therein, a plate fixed to the inner side of the end wall of said bed and formed with a threaded aperture, a screw extending through the aperture in the foot and into the threaded opening in said plate, the other of said legs being formed with an L-shaped foot one limb of which engages the top and the other limb the end wall of said bed, a clamp having one of its ends entering an aperture in said bed, and a thumb-screw carried by the other end of said clamp and bearing at an angle on the foot at the intersection between said limbs.

7. In combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls, an actuating shaft journaled in said bed and abalance-wheel fixed to said shaft, of a frame, gearing rotatably carried by said frame and operatively connected to said balance-Wheel, a hand-crank for actuating said gearing, depending legs carried by said frame, one of said legs being formed with a foot which is adapted to be fastened to the end Wall of said bed, the other leg being formed with an L-shaped foot the limbs of which engage the top and end wall of the bed, means for holding said last mentioned foot firmly against said bed, and a bobbin-winder pivoted to said frame and adapted to be moved into engagement with the belt-groove in said balance-wheel.

8. In combination with a sewing machine having an inverted trough-shaped bed with depending side and end walls and an actuating shaft journaled in said bed, of a frame, hand-operated mechanism carried by said frame and operatively connected to said actuating shaft, a depending leg carried by said frame, and formed with an L-shaped foot the limbs of which engage the top and one of the end walls of said trough-shaped bed and a clamp for holding said foot against the top and end wall of said bed, said clamp being inclined relative to the top and the end wall of said bed.

RAYMOND L. PLUMLEY. RICHARD K. HOHMANN. 

